Portion of an adjustable headset for an electronic device



FIG. 1 is a front perspective view of a portion of an adjustable headset for an electronic device showing my new design, in an open position;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front perspective view thereof in an alternate folded closed position.

The broken line portions shown in FIGS. 1 through 7 illustrate environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for portion of an adjustable headset for an electronic device, as shown and described. 